Question

Copper(II) sulfate pentahydrate, CuSO4 ·5 H2O, (molar mass 250 g/mol) can be dehydrated by repeated heating in a crucible. Which value is closest to the percentage mass of water lost from the total mass of salt in the crucible when the crucible undergoes repetitive heatings until a constant mass is reached?25%13%36%26%

Answer 1

Answer:

The percentage mass of water lost from the total mass of salt is 36%.

Explanation:

Molar mass of copper sulfate pentahydrate ,$CuSO_4.H_2O=250 g/mol$

Number of water crystallization = 5

Molar mass of water = 18 g/mol

Percentage of mass water =  The percentage mass of water lost from the total mass of salt

Percentage of mass water:

$\frac{5\times 18 g/mol}{250 g/mol}\times 100=36\%$

The percentage mass of water lost from the total mass of salt is 36%.